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CVE Record

CVE-2021-2323: Vulnerability in the Oracle FLEXCUBE Universal Banking product of Oracle Financial Services Applications (c...

Vulnerability in the Oracle FLEXCUBE Universal Banking product of Oracle Financial Services Applications (component: Flex-Branch). Supported versions that are affected are 12.3, 12.4, 14.0-14.4 and . Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle FLEXCUBE Universal Banking. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle FLEXCUBE Universal Banking accessible data. CVSS 3.1 Base Score 5.9 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).

MediumCVSS 5.9Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-2323 affects Oracle FLEXCUBE Universal Banking Flex-Branch. An unauthenticated attacker with HTTP network access could, under difficult conditions, gain unauthorized access to critical banking data. The issue is confidentiality-focused, not integrity or availability, but the data sensitivity makes it operationally important.

Executive priority

Treat as a moderate-priority banking data exposure issue. Prioritize systems that hold customer or transaction data and are reachable over HTTP from untrusted or weakly segmented networks.

Technical view

Oracle lists affected FLEXCUBE Universal Banking versions as 12.3, 12.4, and 14.0 through 14.4. CVSS 3.1 is 5.9: network exploitable, high complexity, no privileges, no user interaction, unchanged scope, high confidentiality impact, no integrity or availability impact.

Likely exposure

Exposure is most likely in financial institutions running Oracle FLEXCUBE Universal Banking with the Flex-Branch component on affected versions, especially where HTTP access is reachable from broad internal networks or the internet.

Exploitation context

The source bundle does not show CISA KEV listing or active exploitation. Oracle describes exploitation as difficult, requiring unauthenticated HTTP network access. No exploit details are provided in the cited sources.

Researcher notes

Evidence is limited to Oracle and CVE records. No CWE, exploit status, or detailed remediation text is included in the bundle. Avoid assuming exploitability beyond the CVSS vector and Oracle description.

Mitigation direction

  • Check Oracle July 2021 CPU guidance for the applicable FLEXCUBE update path.
  • Upgrade or patch affected FLEXCUBE versions according to Oracle-supported guidance.
  • Restrict HTTP access to FLEXCUBE interfaces to trusted networks only.
  • Review authentication and segmentation controls around Flex-Branch endpoints.

Validation and detection

  • Inventory FLEXCUBE Universal Banking deployments and identify Flex-Branch usage.
  • Confirm whether versions 12.3, 12.4, or 14.0-14.4 are present.
  • Compare installed patch levels with Oracle July 2021 CPU guidance.
  • Review HTTP exposure paths to affected FLEXCUBE services.
  • Check logs for unusual unauthenticated access attempts against FLEXCUBE endpoints.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-2323 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.9 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.9CVSS 3.1MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N2.23.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.9Medium
CVSS 3.1 vector shape for CVE-2021-2323Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Oracle CorporationFLEXCUBE Universal Banking12.3, 12.4, 14.0-14.4Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.